Clothing Size Converter

Frequently Asked Questions

Why do US and EU clothing sizes differ so much?

EU sizes for women approximate the bust measurement in cm (size 38 is roughly a 92 cm bust). US sizes are arbitrary numbers that have shifted over decades through "vanity sizing."

Is UK size the same as US?

For women, UK sizes are about 4 numbers larger than US (UK 12 = US 8). Men's sizes (chest in inches) are mostly the same on both sides.

What does "Italian sizing" mean?

Italian women's sizes are typically 6 numbers larger than EU (IT 44 = EU 38 = US 8). Italian menswear matches EU for chest size.

How accurate are size charts?

Size charts are guidelines. Cut, fabric stretch, and brand fit philosophy can shift effective size by a full number. Always check the brand's own measurements.

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Estimates for informational purposes only.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.

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How This Calculator Works

There is no single international standard for clothing sizes, so converting between US, EU, UK and Italian sizing means looking up a cross-reference chart rather than applying a formula. Select your gender, enter the size you already know, and choose the system it comes from; this tool finds the matching row in standardised men's and women's charts and displays the equivalent in every other system at once. For letter sizes (XS, S, M, L) it matches exactly; for numeric systems (EU, UK, IT and US numeric) it shows the closest-match row when your exact value is not printed on the chart, which is common because manufacturers round differently.

Formula / Method

For letter sizes the tool does a direct table lookup, normalising case so "m" and "M" both match. For numeric systems it scans the chart and selects the row whose value in your chosen system has the smallest absolute difference from your input - a nearest-neighbour match - then reads across that row. Useful relationships baked into the women's chart: UK is generally US numeric + 4 (a US 4 maps to UK 8), and EU is roughly US numeric + 32 (a US 4 maps to EU 36). Italian women's sizes run in even increments starting near 36 for XS.

Worked Example

A woman with a US size 6 (letter L) selects "US numeric." The chart row for US 6 reads across to EU 38, UK 10 and IT 42 - matching the +4 (UK) and +32 (EU) rules. For a man buying a jacket abroad: he knows he wears a Medium, selects "US letter," and the chart returns EU 48, UK 38 and IT 48, corresponding to a chest of roughly 38-40 inches. If he instead enters EU 49 (not on the chart), the nearest-neighbour match snaps to EU 48 and returns the Medium row.

Common Mistakes

Trusting the label over the tape measure - decades of "vanity sizing" mean US numbers have drifted, so two garments marked the same size can differ by inches.

Assuming UK equals US - UK women's sizes run about four numbers higher than US numeric.

Confusing men's EU jacket sizes with chest centimetres - EU 50 is a chart size, not a 50 cm chest.

Ignoring brand and cut - charts give a starting point; Italian and slim-fit lines often run small.

Reading a closest-match result as exact - if your numeric input was not on the chart, treat the returned row as approximate and verify with body measurements.

Tips & FAQ

Why do sizes differ between countries? US sizes derive loosely from body measurements but have shifted through vanity sizing; EU sizes generally follow chest or bust in centimetres; UK women's sizes sit about four numbers above US numeric; Italian sizes track chest/bust in even increments. Women's quick reference: XS = US 0-2 / EU 32-34 / UK 4-6 / IT 36-38; M = US 4-6 / EU 36-38 / UK 8-10 / IT 40-42; XL = US 8-10 / EU 40-42 / UK 12-14 / IT 44-46. Men's quick reference: M = EU 48 / UK 38 / IT 48 (chest ~38-40 in); L = EU 50 / UK 40 / IT 50 (chest ~40-42 in). What if I am between sizes? Measure your chest or bust with a tape, compare to the centimetre values, and size up for a relaxed fit or when buying Italian or slim-cut lines. Are these charts universal? They are widely used averages; always check the specific brand's own size guide before buying.

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